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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb54fba240bdb25c71e3ef01db00031fae7e0337ac83409cb11e794b5ad1388e' 
  AND token = '4BzcIAY3sV5IDNb8khVKh1qU9up7sx/ZfnEPg5yF/2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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