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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1122ac9057d53d4c16647f9f24961610580e398bbd56b0ac1c353e57907d8199' 
  AND token = 'QXT3chp75KYEkabnW+MrKK4Dt2xrt9V/0mmlfI89oLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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