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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb580f6d6d8ec5db702ca81f09ac7a7fbd4ce96f30d3f4f6a45a148b824b17b' 
  AND token = 'OSy5xpuK6rL2D0xooeqXIVOdnshnjs6FLnhTEKJ0IDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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