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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88519a0465cc0bc98c84806e7d592545ae0e026f05923012967bab7e62f682f8' 
  AND token = 'nN+OFAvmRwO7FuxbuS5wnuxO8Skm0U+7YRvDxV9QqBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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