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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daaa0164b9a836648fb705779810015b1f2421ff82226e434079eb108c54a790' 
  AND token = 'ZLiSQ5NmfKsn4fwtkLiWv0Zbv3Kica2PlbmzgCQ56FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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