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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4defd36ce09dc18f65acdb671c2d887befb8bfce80c075deefb536bd623263e4' 
  AND token = '70eGT0LPSgwTOvLtXNe+EVxZEV7uz0zXiN/8P8kKlrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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