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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf615f9512f24a48761f12126e47e1bd5a3561644b9085710c307d551c2a438' 
  AND token = 'zOmbRuFHIEK6Mb4B+mQv+z7jBX/ea2/O5XUqKSsH78M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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