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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca98146035b2da66afee9f5f763e5765cd49736d92c4e19cc3d06b97c09daf7a' 
  AND token = 'gNtTJaP6S89tggu9xAUX90eceJTc9E1q5nUg6VAvj2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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