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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927438428c42fe45bf75ab5bacb2870e31eaa527c9447c52ebe21ecd5d595e9a' 
  AND token = 'qYd5/EM+WwyKwSPD9GMncIhLJtzcmvgq5Zy0DYR7IZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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