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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea26cbb999d9a108be14d48f7b28071428a89bf70fa43e84b01794cdf3ab75c' 
  AND token = 'Mwkg5tZUGKBrfBqRgnURtM7d8mPaDrW+EC8yFgfjIP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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