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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c9e098b2f9068757a88cb162566b8b8c6365b6a6c2a5492f44f10bfe3c459c' 
  AND token = 'SfB01vNEvkz0X21uc3NJy6PWyufHlzagh6b7twbpHbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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