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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1335845ded18df0be636ddcf960e08eecf2f0cd2803f3ce8b71421819066ddfd' 
  AND token = 'J3Fw5c6hiMV6SfLuv2FJmc98XQjpoTuKAakwXTHNIOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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