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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19786e5610d52d6c1ade97b2d146d6ed016db447eee100e1b90009452eaee82d' 
  AND token = 'BW/lCY9eht8H1QLcd3rMfdMQ36/DFyTdpVb/HoJFDcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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