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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0945ee405c183b34ad1bd5b32054ff2e954554d05fd463b27f81d97b65e4a66d' 
  AND token = 'GXEUPW5nhCB2OUMgujVQmn1rFKChgWdjc1jesOmoy/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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