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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce98022986ae82c3352813d849486ad6f6c1456fa5ac05a62202596b670d3a0f' 
  AND token = '6+7jQ9rxYeu58X8g9hSbwvPayt+i5LlYY2H7YxIJqk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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