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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad578bb1b8a5776a8257f27855c502758439b48e78a711ac6ded3c059828cc5' 
  AND token = 'fdFi/JqPbzbJy4cQ8Cuj+Kp4wpkJMEE5TADE9HM0wdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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