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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06523280f4e351fc344565fd1a1f979c11020c10ab3424c580a2fd7947ad61cb' 
  AND token = 'HnnWlab03ZIZIBHZM03ok4MSft9GpNDuhFPpl8CwVF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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