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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e71e151ba49817c82de90e260a28bbe424778fdf9106d6ce5c8e0ce1760fb9' 
  AND token = 'gB0WQlGLnwgy26doSCcIkLA8EK51XKczdPojc8uuG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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