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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea64aac7c61244e111c6abc08edc3981ede68fa3e161da898bae7cf8760b93fb' 
  AND token = 'FKAagqXCPZUg1MVHuBTNoaPsLJUZForh6mxLdy6d7gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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