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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30bf0762114d030f2c72b963c9e31ff349e3feefb37df6846873571c493426c' 
  AND token = 'UTDivobT2Ybe5aXIGBJI5xnxTGV5iXNT+k0ITCeXEzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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