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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc44bc47c7cf8cca020726dfd9ec49d7338d3ee40ca7b480bbc3a574c0942e13' 
  AND token = 'XD6wpPtTigGqtdW80RA5PHznXdHy0H04skF8R1NruPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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