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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b065a0ac02730c485adebd631ff9ffcf124e9cd0b7efd29d1dd1864f5c99d3c7' 
  AND token = 'VeAH+1zSymW3YEbmWpBeolZd/0jUeZRAuIrKsSV//Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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