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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2691182f1049e350d8675be4661f2caea99aa00662ce674c327e120fa15244e0' 
  AND token = 'gVPGK+6Oi7bq7AIVVvXzmcegbnw8zxWEUMufp97F8KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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