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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2ed1f43d711f5e077aed467bf006f812b6eb879965e487e3de5e1410db085b' 
  AND token = '8+bKQIl8h4JfjlQpqJEboxjV84U/5yzTdFjx4yWruRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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