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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779d2c7b509bc9397ce56203c2d1de0af6b049eae26ecc5b9bb0c0ba791dfebd' 
  AND token = 'wxlsmRmtpEfIm6j7vtv1BlY67aQNlYbeKkk85pN33IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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