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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42356ba5fc78a681a8023bbf280cc8c4a30b0402a14a95689a8dc9cfa28493e5' 
  AND token = '1gslvBOOvMH85tFmISWAsup77l6WWg7Wm/8w1tYga5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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