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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d27511fe5a45a72159d2bf9d5b418df6edecb26d583edf39651b6323f0df571' 
  AND token = 'Qwgq21RiefyJcrsLXhrYi92L2Pod7m2aZz5AWsMviRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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