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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a8e013558f6db0999bb9644d635b2104427d204f19209b34ed8430635d7011' 
  AND token = 'ZCH6oB1HXM9tOesbRV6DUKd1IAJW6073TEjy4N0IDHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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