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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e73e14dcbe12e4439a3ebc976a31d957e8d56fd3cc01bfe5ce505ff17ba350d' 
  AND token = 'xCqgsmjwpxMZowLtX5Tr9ylSYrh65h4OaH8XyWp/vh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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