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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e013312843cf48537caf704c43fb3efd71e29c7f175929d9ee891cc8aacde8f' 
  AND token = 'o7qi57D9v9MT7T7SNWF7PuOWfM2+1cIhb+5BDRsMRls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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