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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d42bf125e2660fe2cf95acc19d4cbafff92df1340f6eb6f0b295a07ff904ee' 
  AND token = 'u/687ECCkDp79cU3ZqTImt1rf1V2m3MXB0Pe7U4nRP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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