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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5731f50ea47c0ce7a2ee584360f62dd1cb893f97a53c5e55aebac88c38dd9bfe' 
  AND token = 'vVYXSyMIW0UFKNK6Xifn2zNFyOr2et4B45iuDOghqn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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