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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de083425fe8e9882a67eb886bf1f2b06f7ae1c7650240ebffea759a460905e3' 
  AND token = 'WzTWS3gCoUyLXnJoZimLwvYdH+yAF6Das1E2auxEKAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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