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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef00a5c7ce6da9d1a9cb24db258793e499ead1d740be87b4cff6e7d059e60087' 
  AND token = 'LdbNP11STHMDcJbyv9IDASgnRQXqBUxeqri05v9RiUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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