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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f133c9286dd8ce9193f34884989b1dcedd417e7f446aa44d6b99c613656ebd8' 
  AND token = '8qWAOvlQQGTah48beyai6Z8Dd1DL4VxVn3FIKqMaCvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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