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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2cff7fbbcd779caa01bd23a4436d093c31245a9a6f54f337bd303ed06047e8' 
  AND token = 'Jrxj6nUPIVW1vp1CCo0wTUSB0FPeYtWsGs3RYxHCXsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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