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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b2b2707e7afb99b15f56ba2203e8f821c9d56dd0545064d1a07212f4db9af0' 
  AND token = 'mwyY7MMSAMSEWMU+PmZ9BT7KWZi6LudWM6ZfrcZsfW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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