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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feaadfae439b0629da2090c255cf1e37d81b767f7965ed12e6e31f0f587b648d' 
  AND token = '64iu6JzFLsCWtaSONGBI4jrfCI5jYa7SI/uVnrM79bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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