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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ffe5410673c16dab8ed6334952ed6265489a9bea89a4fcf27cc64d1f46185a' 
  AND token = '8R/1xYI+R0H6hwyFkEFkJaQROtEdj/FPCAo+DTg5DjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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