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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc5a0ba116667afb0dfe4bec2b28cbabe9fb994d1eae0dfd38473ab474aedcf' 
  AND token = '97EzQNC0Wj2B/7vGzqkAeNELJ/2djuLiCSqwK5piL5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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