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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab8d4a035f4e23b4e8bd2248fa34bc6be7fa53366d2da16c78db6383a21f41f' 
  AND token = 'rAYvFfXL6Y7lNb9SMyeVPz9r5YwIXt/NO/K2L7MCIRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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