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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0d8cd498d441a9fab9ae8712046d4245db811cee360ff2e0c2b29ea300f3ae' 
  AND token = 'yorikB1iuivLXTF//T2b1IfbPvJZAGVK0/fEE1a601I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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