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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa082e125d1ad21263c12ace1bb0a22ddc147eca64ed77d4510347c4c30ddd25' 
  AND token = 'LI9xfzWNphJy5ZkAYS4tU2JbetDHOHYWXNrMVioXdos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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