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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e430c69761b40a08eb864c39214d8ef3aee3e6cf8615376373fc5c542d35431d' 
  AND token = '3QYmnT6m3a5d+WQb3KTXB5KoPiiV+L7O1dS90F6n39k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}