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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0fa90a74093f1c9513f9c1cbda4cd1e212bbfd490cf9b1bf32ef594a5ea708' 
  AND token = '6WXCx9AR1DoVeTmbZtuO4F8YbyjvBAbC74HVigIAAHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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