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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af54d6126eedb014c8b446520c364a73b84cc0ba842bb1657a921439da5138c4' 
  AND token = 'KWfFRpuMZuaWy/EUkIrERRiIeCTYWsoVs4aD6G+xns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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