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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a768dd0dbcc32b151f2ef14125c116b77eea22908600384f0711c3c0a82b65fa' 
  AND token = '4riA1cUExoRUPZsPFzXGx1KyKeQhFytLTaakceUuhuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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