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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d7d6e5184ee0675209fb7a73f6ef9c1250252c23f59cf7895e7b44dc49ad2b' 
  AND token = 'BmHJFneGJLQE1D7jaFU0j27Gj9UYKyYK9ykVYcwS2SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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