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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4034a32c9ef09dc919d9bfa0f5948beda0be37780c5562511b1036b2168c349b' 
  AND token = 'Mxa4TBGO/Qwy4dFl5PZa5bbOehcvLcuE/CfcWJ+PEy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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