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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f988febc5a6d1a441cbaa6a27d23d0ff6fadc20d72be0b363f7c1fb7b72ef0e6' 
  AND token = 'LDGTz00n19ExWRW/ET0BtGwF3XkmfXWiTy7jqear5W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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