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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e6494de4864aa7301f28f5365351f2d8b409ce102d36b1b4f95e3eb587d313' 
  AND token = '1QWt0S9w0qTddmcoyoOwwxnoll7uEzzAVdHCJWFsygc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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