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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e605aa10ff1f633c016d7e4d6e44bc202f8a6516b58ee0f69d6aa3a28f8d394' 
  AND token = 'JBcesoS/xv5lpCO5DskSx0d5dYGpBsApBgONCSche+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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