SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f5577962b99f4b3275a934f4463470ba0b00e5955be21798fd2def6c9687da' 
  AND token = 'YXmiT3s/NFZpDHdq2Ku5Vlka9QtckzDiOI+QqJPQCIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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