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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae6a5085d764b7a5384a25c8848b36aeeeea34255cd66df29cb0c63aa4d057e' 
  AND token = 'ij0ZLw5EBK6BbvZAuRvZ4+OG/c/BhE/9z/q1eQ/+pdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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