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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bb6cf0c4384e04d0328e0ca28e1f3a23981d8cd1d44b66f41b3b18d167496f' 
  AND token = '4nVfx31RFFHygg8ThUoRBfE3VIY55S6G76egwp+3IeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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