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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6535a1092f63160a90e9ec5a01a2b7c04bdebcdc758684303863939a861a828a' 
  AND token = 'arIlRcn8sPI/n4cScdU1KhfRjF1QqSII50dlYQIqd0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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